body {
    background-color: #385773;
    font-family: "Helvetica Neue", "Hiragino Sans GB", Helvetica, "Microsoft YaHei", "微软雅黑", "宋体", Arial, sans-serif;
}
.dux-login { position: absolute; top: 50%; margin-top: -140px; left: 50%; margin-left: -150px; }